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Method for reconstructing nonuniform temperature field inside structure and based on transient-state thermal boundary inversion

A transient thermal and non-uniform technology, applied to physical/chemical changes in thermometers, thermometers, measuring heat, etc., can solve problems such as slow response speed, temperature changes or stress concentration of easily damaged sensor structures, and limited to the surface of the structure, etc.

Active Publication Date: 2015-07-22
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

However, this method has some limitations. For example, installing sensors through holes is easy to destroy the original shape of the structure, resulting in local temperature changes or stress concentration, and its response speed is slow. There are still some problems in the real-time measurement of internal temperature.
Infrared heat map, phosphorescence heat map, etc. can realize non-destructive measurement of temperature, but only limited to the surface of the structure

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  • Method for reconstructing nonuniform temperature field inside structure and based on transient-state thermal boundary inversion
  • Method for reconstructing nonuniform temperature field inside structure and based on transient-state thermal boundary inversion
  • Method for reconstructing nonuniform temperature field inside structure and based on transient-state thermal boundary inversion

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Embodiment Construction

[0036] The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0037] The key points of the reconstruction method of the non-uniform temperature field inside the structure based on transient thermal boundary inversion are as follows:

[0038] 1). The acquisition of the transient thermal boundary needs to solve the heat conduction inverse problem. In the heat conduction inverse problem, the measurement signal is the transit time on the ultrasonic pulse echo propagation path, that is, the temperature accumulation on the ultrasonic propagation path;

[0039] t tof = 2 ∫ 0 s 1 V ...

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Abstract

The invention discloses a method for reconstructing a nonuniform temperature field inside structure and based on transient-state thermal boundary inversion. The method includes that on the basis of transition time of ultrasonic pulse echo, transient-state thermal boundary conditions causing temperature change of the structure is inverted; on this basis, non-steady-state temperature distribution inside the structure is reconstructed by solving a thermal conduction equation. Compared with existing ultrasonic temperature measuring methods, the method has the advantages that ultrasonically-detected inside temperature is not acquired directly through transition time and is acquired through inverted transient-state thermal boundary conditions, so that temperature in the method is not a single average value on a transmission path any more but specific temperature distribution, and the method is higher in temperature resolution and higher in stability and can realize realtime and high-accuracy reconstruction of temperature distribution inside solid structure at different moments.

Description

technical field [0001] The invention relates to the technical field of non-contact measurement of temperature inside structures, that is, a method for reconstructing the temperature distribution inside a structure at different times by inverting the transient thermal boundary based on the transit time of ultrasonic waves. A reconstruction method of the non-uniform temperature field inside the structure developed. Background technique [0002] The detection and real-time monitoring of the temperature inside the structure is not only of great value in military fields such as aerospace, but also has broad application prospects in engineering problems such as material preparation, medical detection, casting and metallurgy in the civilian field. At present, the temperature measurement inside the structure mainly adopts the contact method, that is, it is measured by installing a temperature sensor. However, this method has some limitations, such as perforating the sensor to easil...

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Application Information

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IPC IPC(8): G01K11/24
Inventor 石友安魏东曾磊桂业伟杜雁霞官睿张昊元邱波
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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